Hybrid drive system

Abstract

A hybrid drive system has an engine ( 11 ); a motor-generator ( 16 ); a transmission ( 12 ) for converting drive force inputted from at least one of the engine ( 11 ) and the motor-generator ( 16 ) and transmitting the converted drive force to a drive wheel ( 15 ); a first rotating shaft ( 41 ), a second rotating shaft ( 42 ) and a third rotating shaft ( 43 ) disposed mutually in parallel. The drive system includes a first gear wheel ( 21 ) disposed coaxially with the first rotating shaft ( 41 ); a first clutch ( 31 ) for engaging/disengaging the first gear wheel ( 21 ) with/from the first rotating shaft ( 41 ); a second gear wheel ( 22 ) disposed coaxially with the second rotating shaft ( 42 ); a second clutch ( 32 ) for engaging/disengaging the second gear wheel ( 22 ) with/from the second rotating shaft ( 42 ); a third gear wheel ( 23 ), engaging with the first gear wheel ( 21 ) or the second gear wheel ( 22 ) and disposed coaxially with the second rotating shaft ( 42 ) or the first rotating shaft ( 41 ); and a third clutch ( 33 ) for engaging/disengaging the third gear wheel ( 23 ) with/from the first rotating shaft ( 41 ) or the second rotating shaft ( 42 ). The motor-generator ( 16 ) is connected to the first rotating shaft ( 41 ). The engine ( 11 ) is connected to the third rotating shaft ( 43 ). The transmission ( 12 ) includes an input disc ( 12 a ) connected to the third rotating shaft; an output disc ( 12 b ) disposed coaxially with the input disc; and a power roller ( 12 c ) sandwiched in a tiltable fashion between the input disc and the output disc.

1. A drive system for a hybrid vehicle, having:
 an engine; 
 a motor-generator; and 
 a toroidal continuous variable transmission for converting a drive force inputted from at least one of the engine and the motor-generator and transmitting the converted drive force to a drive wheel, comprising an input disc and an output disc disposed coaxially; 
 the motor-generator comprising: 
 first engaging means for selecting transmission or non-transmission of drive force between the motor-generator and the input disc; and third engaging means for selecting transmission or non-transmission of the drive force between the motor-generator and the drive wheel; and 
 the transmission comprises second engaging means for selecting transmission or non-transmission of drive force between the output disc and the drive wheel. 
 
   
   
     2. The drive system for a hybrid vehicle as defined in  claim 1 , wherein
 when the second engaging means is disengaged, and the first engaging means and the third engaging means are engaged, the vehicle is driven in reverse by means of the drive force of the engine. 
 
   
   
     3. A drive system for a hybrid vehicle, comprising:
 an engine; 
 a motor-generator; 
 a transmission for converting drive force inputted from at least one of the engine and the motor-generator and transmitting the converted drive force to a drive wheel; 
 a first rotating shaft, a second rotating shaft and a third rotating shaft disposed mutually in parallel; 
 a first gear wheel disposed coaxially with the first rotating shaft; 
 a first clutch for engaging the first gear wheel with the first rotating shaft and disengaging the first gear wheel from the first rotating shaft; 
 a second gear wheel disposed coaxially with the second rotating shaft; 
 a second clutch for engaging the second gear wheel with the second rotating shaft and disengaging the second gearwheel from the second rotating shaft; 
 a third gear wheel, engaging with the first gear wheel or the second gear wheel and disposed coaxially with the second rotating shaft or the first rotating shaft; and 
 a third clutch for engaging the third gearwheel with the first rotating shaft or the second rotating shaft and disengaging the third gear wheel from the first rotating shaft or the second rotating shaft; 
 wherein the motor-generator is connected to the first rotating shaft; 
 the engine is connected to the third rotating shaft; and 
 the transmission comprises:
 an input disc connected to the third rotating shaft; 
 an output disc disposed coaxially with the input disc; and 
 a power roller sandwiched in a tiltable fashion between the input disc and the output disc; the speed ratio being changed by varying the angle of tilt of the power roller. 
 
 
   
   
     4. The drive system for a hybrid vehicle as defined in  claim 3 , further comprising a fourth gear wheel disposed coaxially with the third rotating shaft and the input disc, wherein
 the second rotating shaft is a hollow shaft which is disposed coaxially with the third rotating shaft; 
 the output disk is connected to the second rotating shaft; 
 the first gear wheel meshes with the fourth gear wheel; 
 the third gear wheel is disposed coaxially with the first rotating shaft and meshes with the second gear wheel; and 
 the third clutch engages the third gear wheel with the first rotating shaft, and disengages the third gear wheel from same. 
 
   
   
     5. The drive system for a hybrid vehicle as defined in  claim 3 , wherein, when the second clutch is disengaged and the first and third clutches are engaged, the vehicle is driven in reverse by means of the drive force of the engine. 
   
   
     6. The drive system for a hybrid vehicle as defined in  claim 3 , wherein the number of teeth on the third gear wheel is lower than the number of teeth on the first gear wheel. 
   
   
     7. The drive system for a hybrid vehicle as defined in  claim 3 , wherein, when the third clutch is engaged and the first and second clutches are disengaged, the vehicle is started off forward by means of the drive force of the motor-generator. 
   
   
     8. The drive system for a hybrid vehicle as defined in  claim 3 , wherein the first to third clutches are dog clutches. 
   
   
     9. The drive system for a hybrid vehicle as defined in  claim 3 , wherein the first clutch is a friction clutch. 
   
   
     10. The drive system for a hybrid vehicle as defined in  claim 3 , wherein the second clutch is a friction clutch. 
   
   
     11. The drive system for a hybrid vehicle as defined in  claim 3 , wherein, when the first clutch is disengaged and the second and third clutches are engaged, the vehicle can be driven forward by means of the drive force of the engine and the motor-generator, the transmission transmitting the drive force of the engine and the third gear wheel transmitting the drive force of the motor-generator. 
   
   
     12. The drive system for a hybrid vehicle as defined in  claim 3 , wherein, when the third clutch is disengaged and the first and second clutches are engaged, the vehicle can be driven forward by means of the drive force of the engine and the motor-generator, the transmission transmitting the drive force of the engine and the first gear wheel transmitting the drive force of the motor-generator. 
   
   
     13. A drive system for a hybrid vehicle, comprising:
 an engine; 
 a motor-generator; 
 a transmission for converting drive force inputted from at least one of the engine and the motor-generator and transmitting the converted drive force to a drive wheel; 
 a first rotating shaft, a second rotating shaft and a third rotating shaft disposed mutually in parallel; 
 a first gear wheel disposed coaxially with the first rotating shaft; 
 a first clutch for engaging the first rotating shaft with the third rotating shaft, and disengaging the first rotating shaft from the third rotating shaft; 
 a second gear wheel disposed coaxially with the second rotating shaft; 
 a second clutch for engaging the second gear wheel with the second rotating shaft and disengaging the second gear wheel from the second rotating shaft; 
 a third gear wheel disposed coaxially with the second rotating shaft and meshing with the first gear wheel; and 
 a third clutch for engaging the third gear wheel with the second rotating shaft and disengaging the third gear wheel from the second rotating shaft; 
 wherein the motor-generator is connected to the first rotating shaft; 
 the engine is connected to the third rotating shaft; and 
 the transmission comprises:
 an input disc connected to the third rotating shaft; 
 an output disc disposed coaxially with the input disc; and 
 a power roller sandwiched in a tiltable fashion between the input disc and the output disc; the speed ratio being changed by varying the angle of tilt of the power roller.